Car truck



Oct. 12, 1943. H, Y. CARPENTER CAR TRUCK Filed Sept. 26, 1941 2.Sheets-Sheet'l C'arlren ter k, V.. R E E v u n m o A r a HY B /l N l/l/l Y f/f/ /IN m.

Oct. 12, 1943. H. Y. CARPENTER CAR TRUCK Filed Sept. 26, 1941 2Sheets-Sheet 2 ll arl HIJJIU Ill /III IIILIIII Y; Carpenter man 1"INVENTOR Harald BY ArroRNEYs Patented Oct. 12, 1943 une TRUCK HaroldUarpenter, Davenport, Iowa, assignor, i Vivy'naucsne.assignments, ttoMcConway &'-Tor1e.y,

I 4 'Cocooratiom Pittsburg Pennsylvania 1 appiicatinseptember 26,oiaims. (o1.

1 invention reiates'to railwaylcar trucks andymore particularly, to'trucksv of the selfaligning swing Amotion Vtypeffor'ireight cars. A' 'iGbiectsof the present invention aref: o'iprovide Aa-truclr of the typedescribedv'which isjofsiix'ipfle :and 'rug-ged construction,whichisecononal -to manufacture, which iis easy to assembla 4v'vhichgperm-its easy--rern lival andmeplacement of -the `v^springs of Itheside frame `without detaching Vthe truck from the 4ear =body,andwhichhas adierlentialcushioning action.v` Y l A With `the above and iotlfi'ero'biects 'in'.view, -lthe f invention may be .said itocomprise thelear-truck yas illustratedv in .the :accompanying drawings,

Ahereeinaiter described, and 'particularly setxjo'nth in the appendedclaims, together suchfyariaitions :andinodications thereof as will vvloeapparent tto one skilled in the` artto which the invention pertains. ep- `Reienance.should :be :had to the .acecnmanying broken away andshow-n infsection; if A y Fig. 2 is avg-fragmentary top plan view, witha portion of the transom and spring plank broken away and shown insection; and

Fig. 3 is a section taken on the line 3-3 indicated in Fig. 2. Y

In the accompanying drawingsone side onl of the truck is illustrated, itbeing understood that the opposite ends of the bolster and transom areidentical and that the supports for the opposite ends of the transom andbolster are also identical, as is common practice in the art.

Referring to the accompanying drawings, the truck is provided with aside frame I which has journal boxes 2 at `opposite ends thereof whichare connected by top and bottom chords 3 and 4, the top chord 3 beingthe compression chord and the bottom chord 4 the tension chord. The topand bottom chords 3 and 4 are connected intermediate their ends by guidecolumns 5 which provide a central opening 6. The columns 5 have upperinwardly oiiset guide portions 1 provided with opposed concave faces,the guide portions 1 being spaced a substantial distance above thebottom of the opening so that the opening is wider at the bottom.

The truck is provided with a transom which consists of spaced crossbeams8 and integral end portions 9. The transom is preferably in the :form ofa one-piece casting, the crossbeams and h,Pa.',:aeorporation of'1941,serialnNairaiic i f' .ins-,zoem Y end members being of'substantialiy -thefsame depth, 1 hollow and of substantia-liyrectangular cross section. g

The end portions of the transom are provided with inclined shoulders IIl whichja-re adaptedto engage ythe inner Vedges of `the guideNport-ions 1 Vof the columns, ,andf' withjinclined flanges'j11`A Awhichove-rliethe outer edges of 'theguidefportions. 'Ihe bottom portion ofthe openingfl'eis wide enoughvto receive the flanges I I, which` mayterminat'e'lshortf ofthe top edge of the transom,

the height of the anges I-I being fless than lthe distance'betweenthe'lower ends of the-guide portions 1 and' the bottom chord f4, 4sothat#the end of the transomf-rnay be inserted-into the )bottom-portion ofthe-opening Xi and thenl lifted into the space between the guide-portions 1i 'of f itl-1e columns. The shoulders Ill andi-langes il:form

' Vdaring channels to` receive the guide portions `1,

and between thefshoulders v|10 and `atiangeSf-I'I the transom-isprovided with vvcorrvexeportionswvhich are received infthe concave)faceswoi the -guide portions 11 of *the columns. A f i A Thefportion-of the bottomcho-rd 1I extending across the vbottom ofthe opening ,26fiso'f tubular cross section,andisprovided with a ilatgihori- "zontaltopwall I3 whichfhas spaced `openings d4.

A' member :15, serves as .xa .support and as a stop for limiting themovement of the transom, is detachably mounted upon the top wall I3 ofthe bottom chord and has a nat bottom g wall I6, which extendssubstantially the full width of the opening 6 and which is provided withintegral positioning lugs I1, which extend into the openings I4 in thetop wall I3 of the tubular bottom chord.

The central portion of the member I5 is tubular in form and provides astop pedestal which has a at top wall I8, which is connected to thebottom IB by the integral side walls of the member I5 and by atransverse web I9 which is integral I with the top wall I8, bottomwallrIG and sides of the member I5. Transom supporting springs 20 aremounted upon the ends of the bottom Wall I6 of the member I5 whichproject beyond the central stop portion. The springs 20 are preferablyof a capacity sufficient to supportthe transom slightly above the topwall I8 of the spring box when the springsare subjected to the weight ofa fully loaded car. The top wall `I8 of the spring box limits thedownward movement,of the transom and prevents exertion of more than apredetermined pressure upon the springs 20.

A suitable cushioning pad 2|, which may bey formed of rubber and fabric,may be attached to the upper face of the top wall |8 of the member I5. Aspring plank 22 is suspended at each end from the transom crossbeams 8by means of links 23 connected at their upper ends by pivots 24 to thecrossbeams 8, and at their lower ends by pivots 25 to the spring plankadjacent its end. l

The spring plank carries cushioning springs 26 at the ends thereof andthese springs support` the ends of a bolster 2l. The weight of the carbody is imposed upon the bolster and, through the springs 25 andsuspension links 23, upon the Vspaced openings, a combined springsupport and transom. which is supported by the springs 20.A

The springs 20 preferably have a greater deiiec-ftion rate than thesprings 26, so that light loads are cushioned principally by the springs20. The load transmitted through both sets of springs to the side frameshas a softer cushion than would be provided by either set of springsalone. Ex-

cessive pressures, however, are imposed solely upon the stiffercushioning springs 2E, which are of suflicient capacity to effectivelycushionlthe heaviest loads.

The differential cushioning action, duel to the stopping o fr of thetransom springs, provides a relatively soft cushion for light loads anda relatively stiiT cushion for vheavy loads. The stop I8 also preventsexcessive oscillation of the springs, and vserves to breakuposcillations of the springs at critical speeds.

It is to be understood that variations and modifications of the specicdevices herein shown and described for purposes of` illustration may bemade Without departing from the spirit of the i invention. i

What I claim is: 1. A car truck comprising side frames, each #stopmember supported on the bottom chord in each side framev opening, eachof said members having a base portion resting upon the top Wall of thebottom chord, said base portion extending across the bottom of theopening and having lugs disposed in the openings of said top wall and astop portion projecting upwardly from said vbase portion intermediatetheends thereof,

springs mounted upon the ends of the base portions of said members andprojecting above the stop. portions, and a transom having its endsinsaid side frame openings and supported upon said springs above saidstop portions.

q 3. A car truck comprising'side frames, each l having a top and vbottomchord and spaced guide having a top and bottom chord and spaced guide`columns connecting said chords, and providing a centrally disposedopening in the side frame, a combined spring support and stop memberdetachably mounted on the bottom chord within .each opening, said memberbeing of tubular form and having a base portion resting upon said bottomchord and a shorter top wall which serves as a stop, springs mountedupon the base portion i columns connecting said chords and providing acentrally disposed opening in the side frame, the portion of the bottomchord extending across the bottom of said opening being of tubular formand having a hat horizontal top Wall provided Withfspaced openings, atubular member .of rectangular crosssection` in the Vopening of eachside frame, each 'of said members having a flat base resting upon thetop wall of a bottom chord provided with lugs projecting into theopenings of said top Wall, each of said members having a centrallydisposed ilat top wall of less length than said base and a transverseintegral stiifening web centrally of said top wall, springs mounted uponthe Aprojecting end portions of said base and projecting above the topwall, and a transom having its ends resting upon said springs.

- HAROLD-Y. CARPENTER.

